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I have multiple plants that are having what seems like similar issues. Could it be nutrient or ph problems? I'll post more pics of the other plants.

A few more plants.

the best way to tell if you have a nutrient problem is to get a soil test.

Off hand, I'd say that the problem looks more like spider mites. They attack multiple plants and cause the stippling effect on the leaves. If enough plant juices are sucked out they look puckered and dry like the peas, but usually they look like the leaves have been scratched like the eggplant and squash. The undersides of the leaves may have bronzing effect or you might see webbing. It is handy to have a magnifying glass or loupe around as these pests are tiny. You can also check by holding a white piece of paper under a leaf and gently tap tap the leaf. If you see what looks like paprika moving, then that will confirm it.

Spider mites like hot dusty weather. Predators control them but you can help by hosing off the undersides of the leaves with a jet of water to dislodge them and keep your plants as healthy as you can by picking off and bagging the worst leaves. Keep the plants well fed and watered so they can survive the attack. Avoid pesticides that will harm the beneficial insects.

Very few chemicals are effective as many spider mites have developed immunity to pesticides, arachnicides like kelthane are generally not available to the homeowner. Use of pesticides will kill the natural predators that would control them and may make the problem worse not better.

I don't have spider mites right now, just white flies and I keep them in control by cutting back the hibiscus and other preferred hosts. I regularly inspect the undersides of the pepper leaves and blast the undersides of the leaves with water every time I water. I don't use many insecticides and I have marigolds alysssum and other nectar plants to attract predators and I plant corn, favorite of the purple lady bug which loves white flies.

I would do something similar with spider mites. I keep my plants healthy watered and fed. Pests attack the weakest plant first. If it is too weak, then I will rouge it out, bag and trash, not compost. Otherwise, I just water the undersides of the leaves when I water. I water early in the morning and if I water in the evening, the leaves have enough time to dry. I inspect the plants. Host plants that can handle it are cut back, the new leaves will come out fine. Plants are spaced to get the best air circulation. I rarely use pesticides, if I do, my favorite is alcohol. I pick off the worst leaves and rub off any pests I can see. For my roses, the papaya mealy bugs are immune to pesticides so now I resort to water and a brush. It works better than anything else. I have companion plants that attract beneficial insects planted all over the yard.

https://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7405.html

Hmm I dunno, I'm new at all of this but I'd guess that its a lack of nitrogen from looking at the yellowing of the leaves. How are you other plants and what is your soil like? I'm new at all of this but maybe mulching might help you out. Could be the spider mite problem like imafan says too.

If the eggplants, cucumbers, and squash are growing this much, I suspect it's too hot for the peas.

I would spray the cucumber and squash with milk solution in case they are having fungal issues.

As a general rule, closely examine underside of any leaves showing discoloration of any sort for possible pests and powdery mildew or other fungal infection signs. Sometimes taking a good well-focused photo and zooming/enlarging the image on the cell phone or a larger screen (computer monitor, ipad, etc.) helps to discover what is difficult to discern by eye.

I'm thinking a variety of things going on. Agree that peas are the earliest of cool weather plants. They get planted as soon as the ground can be worked in late winter. For me that is about a month or so sooner than the last frost date. So they burned up in the heat.

The picture right below the peas, looks to me pretty clearly like a nutrient issue -- chlorosis, where you still have the green veins but the rest of the leaf is yellowing. The plant doesn't have enough nutrients to manufacture enough chlorophyll (which is what makes the leaves green) and chlorophyll is how it gets energy. It could be nitrogen deficiency or it could be some kind of trace nutrient deficiency.

The picture below that with the yellow spots is something different again, either insects or fungus.

There are multiple issues. As you say the fifth picture shows chlorosis on the lower leaves while the top is green and could very well be nitrogen. The eggplant looks more like pests with the stippling o the edge of the leaf. The peas can easily be suffering from heat stress. I can't figure out what could be causing the yellow streaking in the cucurbit leaf.

A lot of these plants are packed too closely together. The eggplants, I think there are multiples are too close to each other, they won't have room to spread. What is next to the eggplant? It looks like a mustard or cabbage relative. I usually don't plant cabbages or mustard next to eggplant because they like different conditions. Eggplant , tomatoes and peppers like more acidic conditions and heat. Cabbages and mustard will alkalinize the soil and they like cooler weather. Eggplant and cabbages or kale are big plants and need a lot of space so I would not have them so close.

It looks like a young garden, as the garden matures the spacing issues will probably just get worse.